Roll heating and cooling



Sept. 27, 1949. o. o OAKS ROLL HEATING AND coouuc 2 Sheets-Sheet l INVENTOR. GFZION Q. 0am

Filed D ec.

Sept. 27, 1949' o. o.' OAKS HELL HEATING AND COOLING 2 Sheets-Sheet 2 Filed Dec. 9, 1947 QQ ms v Q ww Om 0% R B Q. lbw v R i l allfrllllllvl $1M? A N .l Nv Q A @N V O- vv a W 75 A H I J ww @W I r WX vm Jl .9 Q Q mm &1 4 m n Q Q? 9% 0 0 m r 11$ @m Q Nmw m m Q; T E mm m m mm 0 @m g @m A J V \v Nd mm B om w 00 mn 3 law. .Q Ru m M Rm ll u w l &\ WW vml mu KN INVENTOR. 0/2022 0. Oaa

Patented Sept. 27, 1949 2,483,921 aect HEA m esteem:-

' rQri n ii Oaks, Summit, N, .1., assignor, by

. aeratio Debeinbr 9, wastrel are *ZGlaims.

TlaisjnventiQn ,--relates .tola method and apparatus for-,tengperature conditioning rolls and Im re p rticuia l stoxth heating and c lin of troll su table ic im l ne met l; to hn p r ingtfcr the manuiaeture of plastics; for mangles, and fo th re' ar uses- I -lieret for yarieu lmeans hav be np p e for heating and cooling rolls both directly and a-mciirect yiput mos jo l th re re co plic ted niml laratus iof large eats. heat. or to: cool to desiredetemperatu s- $u ep t is n nly eQXIJQ SiYB ab l el ti el i c ent and much ealor ie centent otthelgreat-transfer medium is lost i that would otherwise beayailablefor heating or needin the r- .1.

v:ilaaaerqtmithaa aus a particular class f veh mi al -.-.cQml?Q n th ;--t ra-.ary1 thos icates, as the heat transfer nedium that I can eerierecni izmost-ie z h e s yan a es of exis in d cooling dev ices and provide ,a mere l anp mtu fe ro l heatineat jntrighl legeperatures andi at low pressuresand for cgglingleylgliqh wgilL; require relatively-simple l a esnwhich b mest-- fi1 i t it content A l lheatvin eor; c n ne.

It is accordingly an objcfiil f;thegprese t} n- 'vention to provide a novel method and apparatus efor roll lheatingiorcooling which uses a particular class of; chemical compounds; the tetraaryl ortho silicates; as *the heat transfer medium. 7

Anathe-r, -.ob ject is to -provide such 'apparatus which is of simple-and light construction and el'ficientlyiuses available heat or cold for roll :-l1eatingor cooling.

Another object: .of the present invention; is to -;-.providesuch; amethod thatcan be readily, cheap- ;=ly. and easily utilized'with existing apparatus.

Other and further.objects of the present .in-

ventionl will appear from the-following. descrip- '-tion.

"Thetetra-i-aryl lortho silicates are described in thaJohristonPatent 'No. 2,335,012, datcd-Novem- I ulcer-.23; 1943. As there described thesecompounds k'reniain.' fiuid at: approximately 70 F. and; boil --iri themeigliborhood of'725 F. Within this Wide =ternperaturerange these compounds are efiicient heat transfer mediareadily absorbing and readily :Q'iVil'lE-HP heat or cold applied thereto -No super- ;a-tmospheric-vapor pressures are'generated in --tl1is temperature range so that the nieans utilized *fi i atine the om oun sj a etmade of Jf ii im e QQQ Qrup iQ land f sufficient (c em-'3) tlf eethi cir ul tin r o l' i t q the application of i, more than nominal pressures.

' fiheaeeemr eyie ra n wtw i fth mechanic emb di ent Whi my inven- 'y take, These embodimentsare shown ibed ihereip aiter. to illustrate my' invenheuld ee e 'le definin o .s' l rene b e ha t heappended'cia m ib e h s ilrp s l0 lnv the'ydrawings in Qw; ich-like reference numeral tele ram like ar Fig. l is a View or an embodiment of rn y innati n esteem tram th rpn ,.w t a portion 49 th tlewe r9 h e n wa lt IQ th nev internal y. ea nc-t e same; I'F'e. jzlisa .ta'rjy Q ITQSTS QHOQQ EW of napartpi nthe Jine'A-TIA thereof; and

{Fig.3 is a other embodiment ofnmy invention h ng Qeblin ra s tabl machin bas and carryin roll supports gll wqrqll supportin shaft I 4 is ortsj lZQand, l 3 and hollow roll. I 5 nted ior, rgliatipnv thereon. second roll l rting sl ait xl Eliscarried.,by supports I '2 and l [3 spaced fro d gparallel lto shaftl l 4 and .a

se d roll l'll iskmguntedflmrrotatien thereon ;for,. ooperation withjroll, l5. An electric motor V closed ytfim i employing tetraaryl ortho A silicate as ,the heat transfer medium. is utilized l eath tet ee r k tte sil ee w i' ma t hea e unt ap r xi y 72 th u boiling. r The lceated ,tet -ralyl. ,olttl' o v silicate is .yid r tne closedsystemto take ca eer. any v 1$ 9 r-9 99 bf h t aa r h s .-.Q?W dari ll a ae d cbq n 1 r tum vapclp ress 1r pqnsiyereliei yalve .34 may also be team as eeefety-ieat re anglin -into the S98- ortho silicate.

term and preset to open only under abnormal conditions of pressure or vacuum.

Hollow shaft M is provided inside roll |5 with a hollow extension 33 communicating therewith which carries a T couplin 34. Headers 35 and 36 extend from coupling 34 and are spaced from and are parallel to shaft l4. Headers 35 and 36 are rovided with a plurality of nozzles 31 communicating with headers 35 and 36 and designed to flow heated tetra-aryl ortho silicate onto the upper and under side of roll |'5 of rolling cooperation with roll H, as best seen in Fi 2. V

A dam 38 is placed in hollow shaft |4 adjacent the opening of extension 33 into shaft l4 and forces the entire flow of heated tetra-aryl ortho silicate into extension 33. A downwardly extending hollow extension 39 is secured to hollow shaft l4 and in communication therewith within roll l5 and terminates adjacent the inner and lowest part of roll |5 to drain roll |5 of cooled tetra-aryl A return pipe 40 is coupled to hollow shaft l4 at 4| and leads to a suitable pump 42. Pump 42 is driven by motor I8 through pulley 43, belt 44 and pulley 45. The discharge side of pump 42 is connected by pipe 46 to the return side of boiler 21. A by-pass 41 connects thermostatically controlled valve 30 and return pipe 4|).

Thermostatically controlled valve 39 is actuated by the conventional bulb 48 in heat exchange engagement with roll l5 and connected thereto by tubing 49.

Fig. 3 illustrates an embodiment of my invention suitable for use when it is desired to heat or to cool roll l5. The structure of the rolls and the means for heating the tetra-aryl ortho silicate is the same asthat of the embodiment shown in Figs. 1 and 2. A suitable absorption type refrigcratin unit 59 having a conventional generator 5| and a reservoir 52 for tetra-aryl ortho silicate to be cooled is suitably positioned with respect to boiler 21. Couplings 53 and 54 and manually operable valve 55 are connected into pipe 29. Pipe 56 including manually operable valve 51 connects to coupling 53 and to pipe 13 is provided with couplings 1|, 12 and 13 and with manually operable valve 61 and connects to generator 5| and to pipe 40 at coupling 14. A thermostatically controlled valve with a bypass 16 is connected into pipe 56 and by-pass 16 connects to coupling 1|. Valve 15 is actuated by bulb 11 in reservoir 52 which is connected to valve 15 by tube 18 in conventional manner. Cooled tetra-aryl ortho silicate is taken from reservoir 52 by pipe 62 through manually operable valve 63 to coupling 54. By-pass 41 is connected to coupling 13. Pipe 46 is provided with coupling 64. Pipe 65 connects coupling 64 through manually operable valve 66 to the return side of reservoir 52. A manually adjustable valve 58 and a coupling 59 are also connected into pipe 46. A pipe 19 including manually operable valve 68 connects to coupling 12 and to a suitable pump 80. The drivin means for pump 80 is not shown. The discharge side of pump 80 is connected by pipe 8| through manually operable valve 6| to coupling 59.

With the embodiment of my invention set up as above described for Figs. 1 and 2 when it is desired to apply heat to roll |5 boiler 21 is fired and motor I8 is started. Actuation of motor |8 drives pump 42 and heated tetra-aryl ortho silicate is drawn from boiler 21 through pipes 28 and 29, valve 33 and pipe 3| into shaft M where it backs up against dam 38 and flows intocoupling generator 5|. Return adjacent its line valve 66 and is returned to reservoir 52.

34 and headers 35 and 36. From headers 35 and 36 the heated tetra-aryl ortho silicate flows out of nozzles 31 against the inner and upper side of roll I 5 adjacent its line of rolling cooperation with roll |1 so that at the line of rolling cooperation roll I5 is given maximum heating. The heated tetra-aryl ortho silicate flows down the back and inner side of roll l5 against its direction of rotation and preheats that part of roll |5 approaching the area of contact of heated tetra-aryl ortho silicate flowing from nozzles 31. The used and partially cooled tetra-aryl ortho silicate collects at the lowest point of roll I5 and is drawn therefrom through extension 39, hollow shaft l4 and pipe 46 by pump 42, and return to boiler 21 by pipe 46.

Thermostatically controlled valve 30 is preset for the desired rolling temperature. Should the heated tetra aryl ortho silicate admitted to roll l5 heat the same above this temperature bulb 48, which is in heat exchange relationship with roll l5, will actuate valve 30 to close pipe 3| to the flow of heated tetra-aryl ortho silicate and bypass the same through by-pass 41 back to boiler '21 until such time as roll l5 cools below the preset temperature of valve 30. Bulb 48 will then actuate valve 33 to close off by-pass 41 and open pipe 3|.

Actuation of motor I'll not only drives pump 42 but rotates rolls l5 and H which cooperate to give the desired rolling action. It is to be understood that not only may roll l5 be heated in the manner just described but when desirable roll |1 may be similarly heated. Further, when desirable, the rolling action may take place between heated roll l5 and a fixed surface or a plurality of such heated rolls may be employed in any conventional manner.

The embodiment of my invention described with reference to Fig. 3 can be used to both heat and cool the rolls. When this embodiment is used to heat the rolls valves 63, 66 and 68 are closed and valves 55, 51, 58 and 61 are opened. The function of this embodiment is then similar to that of the embodiment of Figs. 1 and 2 but includes flow of heated tetra-aryl ortho silicate through generator 5| to keep the tetra-aryl ortho silicate in reservoir 52 cooled.

When it is desired to 58 and 61 are closed and 68 are opened. Heated tetra-aryl ortho silicate then continues to pass from boiler 21 to pipes 29 and 56 and to generator 5| and is returned from generator 5| to boiler 21 by pipe 19, pump 89, pipe 8| and pipe 46. The cooled tetra-aryl ortho silicate in reservoir 52 is circulated through pipe 62, when pump 42 is energized through valve 39 and pipe 3| to the 'roll and cools the roll. The tetra-aryl ortho silicate is removed from the roll through pipe 40, pump 42, pipe 46, pipe 65 and Valve desired temperature for below this cool the rolls valves 55, valves 51, 6|, 63, 66 and 30 may be preset to any cooling the roll and when the roll falls temperature bulb 48 actuates valve 30 closing pipe 3| and opening by-pass 41. The cooled tetra-aryl ortho silicate is then Joy-passed around the roll and returns .to reservoir 52 through bypass 41, pipe 16, pump 42, pipe 46 and pipe 65 until :the temperature of the roll rises above that for which valve 30 is preset. Valve 33 then closes by-pass 41 and opens pipe 3| allowing cooled tetra-aryl ortho silicate to again be circulated through the roll. Valve 15 is preset for any desired temperature for the cooled tetra-aryl ortho silicate in reservoir 52 and when the tetra-aryl ortho silicate is cooled below this temperature lbul-b l1 actuates valve 15 to hy-pass generator 5| until the temperature of the tetra-aryl ortho silicate rises above the preset value. A close and accurate adjustment of the cold temperature of the roll is thus obtained.

It will now be apparent that by the present invention I have provided a novel method and apparatus for roll heating and cooling to high temperatures and to low temperatures at atmospheric pressures which uses a particular class of chemical compounds, tetra-aryl ortho silicate, as the heat transfer medium; which employs simple apparatus of light construction; which efliciently uses the caloric content of the medium available for roll heating and cooling; and which can 'be readily, cheaply and easily utilized with existing apparatus.

Changes to or modifications of these illustrative embodiments of m invention may now be suggested to those skilled in this art without departing from my inventive concept. Reference should therefore be had to the appended claims to determine the scope of this concept.

What is claimed is:

1. A system for internally heating a hollow roll using an organic silicate as the heating medium and including means for heating the organic silicate and a hollow roll, a hollow roll shaft upon which the roll is rotatably mounted, piping connecting the heating means and one end of said hollow shaft, a thermostatically controlled valve in said piping, piping connecting the other end of said hollow shaft and said heating means, circulating means for said organic silicate in said second named piping, means within the hollow roll receiving heated organic silicate from said hollow shaft and flowing the heated organic silicate against the inner surface of the roll, a. bypass between said valve and said second piping, said piping constituting a closed system, expansi-on means for the organic silicate connected into the closed system above and adjacent to said heating means and normally closed pressure and vacuum relief means for said expansion means.

2. A system for internally cooling a hollow roll using an organic silicate as the cooling medium and including means for heating an organic silicate and a hollow roll, absorption-type refrigerating means for cooling an organic silicate including a generator, means for circulating heated organic silicate from the heating means to said generator, expansion means including normally closed pressure and vacuum relief means connected into said circulating means above and adjacent to said heating means, a hollow roll shaft upon which the roll is rotatably mounted, piping connecting said refrigerating means and one end of said hollow shaft, a thermostatically controlled valve in said piping, piping connecting the other end of said hollow shaft and said refrigerating means, circulating means for the cooled organic silicate in said second named piping, means within the hollow roll for receiving cooled organic silicate from said hollow shaft and for flowing the cooled organic silicate against the irmer surface of the roll, and a lay-pass between said valve and said second piping.

ORION OT'I'IS OAKS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

